NEW PARASITIC COPEPODS 



By CHARLES BRANCH WILSON 



State Teachers College, WestHeld, Mass. 



(With Three Plates) 



Among the valuable collections obtained during the first Johnson- 

 Smithsonian Deep-Sea Expedition was one made up of the copepods 

 parasitic upon the fish of the region just north of Puerto Rico. 

 Although this included but a few species, the number of specimens 

 was unusually large and the collection proved interesting for several 

 reasons. In the first place it came from a region upon the fish para- 

 sites of which there have been up to the present time no available 

 data. Again, the present collection contains an exceptionally large 

 number of males and with reference to that sex supplies informa- 

 tion hitherto unknown and much desired. We find here for the first 

 time authentic males of Nesippus crypturus, females of which were 

 described 70 years ago. The males of Pandarus cranchii are larger 

 than any previously reported and the three largest ones are covered 

 with blotches of the same dark pigment that characterizes the mature 

 female. Three specimens of a male Specilligus curticaudis, first de- 

 scribed by Dana 80 years ago as a new genus and species, are now 

 found to be simply the copepodid stage of the male of Pandarus 

 cranchii. Finally, three new species were found and are here described, 

 and three other species, already known, were taken from unnamed 

 shark hosts, Alehion carcJiariae Kr^yer, Perissopiis communis Rath- 

 bun, and Kr0ycria gracilis Wilson. 



CALIGUS LOBATUS n. sp. 



Plate I, figs, i-io 



Occurrence. — A dozen females and two males were taken from the 

 outside surface and gills of a pilotfish, Naucrates diicior. 



Type. — A single female, U.S.N.M. no. 64059. The other specimens 

 become paratypes, U.S.N.M. no. 64060. 



Smithsonian Miscellaneous Collections, Vol. 91, No. 19 



